[loeg]

They're pretty similar, but I think 1900x is slightly higher end. (And arguably, better value if you can utilize all the cores.)

i7-7800x (Skylake-X) is a sort-of last gen part (Kabylake-X briefly existed in the form of i7-7740X, although only in a 4-core SKU); 4 GHz is its maximum turbo clock (may be only single core); base clock is 3.5.

1900x is current gen, although about to become last-gen; its base clock is 3.8, 4.0 turbo (single core).

Same number of memory channels. 33% more cores. AMD's IPC lags Intel a little bit, but not by 25%. Is it worth the $60 (15%) premium? Maybe.

When TR2's version of 1900x comes out, TR1 1900x may experience a nice price drop, making it (even) more competitive/affordable.